Mailbox cover



FIG. 1 is a right side elevational view of a mailbox cover showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof; and

FIG. 5 is a bottom plan view thereof.

A side elevational view taken from the left side of the mailbox cover would be a mirror image of FIG. 1. 

The ornamental design for a mailbox cover, as shown and described. 